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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthordelprado
    • CommentTimeJan 31st 2018
     
    Oventrop appear to be used extensively commercially and a mechanical engineer I know has recommended them.

    Has anyone any wisdom on who it is sensible to consider?

    Cheers
    • CommentAuthortony
    • CommentTimeJan 31st 2018
     
    talking UFH, yes, why not make your own?
    • CommentAuthorrevor
    • CommentTimeJan 31st 2018
     
    I would have a look at the Robbens system. I got my complete kit from them for less than it would have cost me to buy bits to make my own. Also you get full drawings, assembled tested manifolds very extensive installation instructions and very helpful help line if you have any queries.
    • CommentAuthordelprado
    • CommentTimeFeb 1st 2018
     
    Tony - what is the benefit in making your own?
    • CommentAuthortony
    • CommentTimeFeb 1st 2018
     
    Cost, all it is a load of valves, some have flow diddlers all have isolator, some bypasses, some have pumps.

    They all cost loads
    • CommentAuthorborpin
    • CommentTimeFeb 1st 2018 edited
     
    The advantage of something like this https://www.ebay.co.uk/itm/underfloor-heating-manifold-6-port-with-Grundfos-A-rated-pump-mixer/182139914892 is

    Actuators to control different zones at different times

    Flow regulators so if you have different size loops you can make them all flow equally

    Mixing valve that only pulls in hot water supply as required and sets flow temperature.

    Guages for temp (important) pressure - why?

    Pump included.

    I'd go for a system like this personally (the above link is *not* a recommendation).
    • CommentAuthortony
    • CommentTimeFeb 1st 2018
     
    Quoting ,"Flow regulators so if you have different size loops you can make them all flow equally"

    This seems silly to me as they will not perform properly, bigger loops = more heat needed = higher volume or warmer water.
    • CommentAuthorgoodevans
    • CommentTimeFeb 1st 2018
     
    Yes Tony that's correct - all things being equal longer loops require more flow, shorter loops less flow - so the flow regulators restrict the flow in the shorter loops. Same logic applies if rooms have different conductive surface and/or a higher proportion of external wall. Some means of balancing is required - either flow regulators on each loop or multiple thermostats and actuators.
    • CommentAuthorgoodevans
    • CommentTimeFeb 1st 2018
     
    Ahh - just re-read the quote - I guess it should read... "Flow regulators so if you have different size loops you can make them all HEAT equally".
    • CommentAuthortony
    • CommentTimeFeb 2nd 2018
     
    Yes, so the little flow indicators are almost useless apart from showing that it is flowing, far more adjustment and balancing is necessary.
    • CommentAuthorTimSmall
    • CommentTimeFeb 2nd 2018
     
    I have two Polypipe 5 port manifolds, one on the ground floor and one on the first floor, which feed 3 rad circuits and 7 UFH circuits. Cost were about £90 each on a popular online auction site as far as I remember. I'd do the same again if installing a similar system.
  1.  
    is there much to fail on a manifold?

    We used WundaFloor for our UFH. I'm sure the finish of some stuff is a little rougher around the edges that premium brands but i didn't have any concern that anything would fail (and they back their stuff with a good warranty)

    https://www.wundatrade.co.uk/product-category/home/manifolds-1/manifolds-4/
    • CommentAuthorTimSmall
    • CommentTimeFeb 2nd 2018
     
    They may well be fine, but I'm not sure that they were around when I bought. Once you add the cost of the pipe connectors, and the isolation valves (both of which were included with the Polypipe manifolds) you're within £10 of the price that I paid for the Polypipe ones anyway.
    • CommentAuthorborpin
    • CommentTimeFeb 2nd 2018
     
    Posted By: tonyYes, so the little flow indicators are almost useless apart from showing that it is flowing, far more adjustment and balancing is necessary.
    The flow indicators also allow you to adjust the flow.
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